PENSACOLA, Fla. (July 27, 2021) Naval Aircrewman (Helicopter) 2nd Class Bret Bristol delivers a water survival training lecture to students at Aviation Survival Training Center (ASTC) Pensacola. ASTCs all around the country deliver safe and effective high-risk survival and human performance training under the Naval Survival Training Institute (NSTI), a detachment of the Navy Medicine Operational Training Command (NMOTC). (U.S. Navy photo by Mass Communication Specialist 2nd Class Matt Herbst)